Found a nice theme here in the comments: Newsbeuter 2.1 will contain support for 256-color terminals « Newsbeuter Development Blog.
# Generic Background
# First value is not used.
color background magenta color237#Text/background when reading an article
color article color188 color237#Color the listview items
color listnormal color188 color237#Selected listveiew item.
color listfocus color108 color236# info
color info color144 color234